Sweet Corn Pheromone Trap Network

for Western NY - 2009

This is a seasonal scouting report giving growers in the Western New
York area information on the presence of sweet corn pests and recommendations
on scouting and thresholds. The report is written by
Abby Seaman, NYS IPM's Area
Extension Educator for Vegetables.

For 9/1/09

ECB catches are down from last week at most, but not all locations.
Corn earworm numbers are lower than last week but still high enough at most
locations to drive the spray schedule. Numbers at most sites call
for a 4-5 day spray schedule in green silk stage fields. Fall armyworm
numbers are up at most locations this week. The corn earworm sprays
should take care of any newly hatched armyworm or corn borer, after any
larger armyworm are taken care of at tassel emergence.

Scouting and threshold information:

Once CEW are being caught in higher numbers, insecticide applications
in silk stage fields should be determined by CEW trap catches. The
recommended spray intervals for CEW should be adequate for ECB and FAW control.
Because CEW lay their eggs directly on the silk, and eggs are difficult
to find in the field unless the population is VERY high, we rely on pheromone
trap catches rather than scouting to make CEW management decisions.
It is most important to adhere to the recommended spray intervals when the
field is in the green silk stage. The chart below indicates recommended
spray intervals during the silk stage for a range of trap catches:

Per Day

Per Five Days

Per Week

Days Between Sprays

<0.2

<1.0

<1.4

No Spray (for CEW)

0.2-0.5

1.0-2.5

1.4-3.5

6 days

0.5-1.0

2.5-5.0

3.5-7.0

5 days

1-13

5-65

7-91

4 days

over 13

over 65

over 91

3 days

Location

ECB-E

ECB-Z

CEW

FAW

Avon (Livingston Co.)

0

2

18

NA

Baldwinsville (Onondaga Co.)

NA

NA

NA

NA

Batavia (Genesee Co.)

0

5

4

13

Bellona (Yates Co.)

3

4

125

280

Eden Z (Erie Co.)

0

8

8

10

Farmington (Ontario Co.)

2

1

18

0

Great Valley (Cattaraugus Co.)

NA

NA

NA

NA

Hamlin (Monroe Co.)

0

3

11

5

Kennedy (Chautauqua Co.)

NA

NA

NA

NA

King Ferry (Cayuga Co.)

0

0

33

NA

Kirkville (Madison Co.)

NA

NA

NA

NA

LeRoy (Genesee Co.)

5

2

7

6

Lockport (Niagara Co.)

0

28

14

6

Medina (Orleans Co.)

0

0

16

37

Owego (Tioga Co.)

0

2

17

0

Penn Yan (Yates Co.)

0

7

28

4

Pike (Wyoming Co.)

1

7

7

10

Plessis (Jefferson Co.)

NA

NA

NA

NA

Spencerport (Monroe Co.)

0

25

16

7

Wayland (Steuben Co.)

NA

NA

NA

NA

Williamson (Wayne Co.)

0

0

0

4

NYS IPM on:

These pages are maintained by the New York State IPM Program, part of Cornell Cooperative Extension. All material is protected by Section 107 of the 1976 copyright law. Copyright is held by Cornell University and the New York State IPM Program.